An analysis of the durations of Swift gamma-ray bursts

	An analysis of the durations of Swift gamma-ray bursts
	Zhang ZB(张志彬)1,2 ; Choi, CS 1
刊名	ASTRONOMY & ASTROPHYSICS
	2008-06
卷号	484 期号:2 页码:293-297
关键词	gamma rays : bursts gamma rays : theory
ISSN号	0004-6361
通讯作者	Zhang, ZB (reprint author), Korea Astron & Space Sci Inst, Int Ctr Astrophys, 36-1 Hwaam, Taejon 305348, South Korea.
产权排序	第二完成单位
英文摘要	Context. Swift detectors are found to be more sensitive to long-soft bursts than pre-Swift missions. This may largely bias the distribution of durations and thus classification of gamma-ray bursts. Aims. We systematically investigate the duration distribution of gamma-ray bursts in the Swift era vs. that of pre-Swift bursts. Methods. For the purpose of this study, statistical methods such as the K-S test and linear/non-linear fitting analysis have been used to examine the duration properties of Swift bursts in both observer and source frames. Results. For 95 GRBs with known redshift, we show that two log-normal distributions of duration are clearly divided at T(90) similar or equal to 2 s. The intrinsic durations also show a bimodal distribution but shift systematically toward the smaller value and the distribution exhibits a narrower width than the observed one. Swift long bursts exhibit a wider duration dynamic range in both observer and source frames in comparison to pre-Swift long bursts. Conclusions. We find that Swift bursts and pre-Swift ones can share the same criterion of classification in terms of duration at 2 s, although both monitors have large differences with respect to sensitivity of a given energy band.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SPECTRAL LAGS ; BRIGHTNESS DISTRIBUTION ; REDSHIFT DISTRIBUTION ; BIMODAL DISTRIBUTION ; MILLISECOND PULSARS ; PEAK ENERGY ; LONG ; EMISSION ; CATALOG ; ORIGIN
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2008/23/aa9210-07/aa9210-07.html
语种	英语
WOS记录号	WOS:000256309700001
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/7039]
专题	云南天文台_星系研究组
作者单位	1.International Center for Astrophysics, Korea Astronomy and Space Science Institute, 36-1 Hwaam, Yusong, Daejon 305-348, South Korea 2.Yunnan Observatory, National Astronomical Observatories, Chinese Academy of Sciences, PO Box 110, Kunming 650011, PR China
推荐引用方式 GB/T 7714	Zhang ZB,Choi, CS. An analysis of the durations of Swift gamma-ray bursts[J]. ASTRONOMY & ASTROPHYSICS,2008,484(2):293-297.
APA	Zhang ZB,&Choi, CS.(2008).An analysis of the durations of Swift gamma-ray bursts.ASTRONOMY & ASTROPHYSICS,484(2),293-297.
MLA	Zhang ZB,et al."An analysis of the durations of Swift gamma-ray bursts".ASTRONOMY & ASTROPHYSICS 484.2(2008):293-297.